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317 lines
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<title>TQPtrDict Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQPtrDict Class Reference</h1>
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<p>The TQPtrDict class is a template class that provides a dictionary based on void* keys.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qptrdict-h.html">ntqptrdict.h</a>></tt>
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<p>Inherits <a href="ntqptrcollection.html">TQPtrCollection</a>.
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<p><a href="qptrdict-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQPtrDict"><b>TQPtrDict</b></a> ( int size = 17 )</li>
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<li class=fn><a href="#TQPtrDict-2"><b>TQPtrDict</b></a> ( const TQPtrDict<type> & dict )</li>
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<li class=fn><a href="#~TQPtrDict"><b>~TQPtrDict</b></a> ()</li>
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<li class=fn>TQPtrDict<type> & <a href="#operator-eq"><b>operator=</b></a> ( const TQPtrDict<type> & dict )</li>
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<li class=fn>virtual uint <a href="#count"><b>count</b></a> () const</li>
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<li class=fn>uint <a href="#size"><b>size</b></a> () const</li>
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<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
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<li class=fn>void <a href="#insert"><b>insert</b></a> ( void * key, const type * item )</li>
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<li class=fn>void <a href="#replace"><b>replace</b></a> ( void * key, const type * item )</li>
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<li class=fn>bool <a href="#remove"><b>remove</b></a> ( void * key )</li>
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<li class=fn>type * <a href="#take"><b>take</b></a> ( void * key )</li>
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<li class=fn>type * <a href="#find"><b>find</b></a> ( void * key ) const</li>
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<li class=fn>type * <a href="#operator[]"><b>operator[]</b></a> ( void * key ) const</li>
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<li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li>
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<li class=fn>void <a href="#resize"><b>resize</b></a> ( uint newsize )</li>
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<li class=fn>void <a href="#statistics"><b>statistics</b></a> () const</li>
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</ul>
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<h2>Important Inherited Members</h2>
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<ul>
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<li class=fn>bool <a href="#autoDelete"><b>autoDelete</b></a> () const</li>
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<li class=fn>void <a href="#setAutoDelete"><b>setAutoDelete</b></a> ( bool enable )</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual TQDataStream & <a href="#read"><b>read</b></a> ( TQDataStream & s, TQPtrCollection::Item & item )</li>
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<li class=fn>virtual TQDataStream & <a href="#write"><b>write</b></a> ( TQDataStream & s, TQPtrCollection::Item ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQPtrDict class is a template class that provides a dictionary based on void* keys.
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<p>
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<p>
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<p> TQPtrDict is implemented as a template class. Define a template
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instance TQPtrDict<X> to create a dictionary that operates on
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pointers to X (X*).
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<p> A dictionary is a collection of key-value pairs. The key is a
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void* used for insertion, removal and lookup. The value is a
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pointer. Dictionaries provide very fast insertion and lookup.
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<p> Example:
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<pre>
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TQPtrDict<char> fields; // void* keys, char* values
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<a href="ntqlineedit.html">TQLineEdit</a> *le1 = new <a href="ntqlineedit.html">TQLineEdit</a>( this );
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le1-><a href="ntqlineedit.html#setText">setText</a>( "Simpson" );
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<a href="ntqlineedit.html">TQLineEdit</a> *le2 = new <a href="ntqlineedit.html">TQLineEdit</a>( this );
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le2-><a href="ntqlineedit.html#setText">setText</a>( "Homer" );
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<a href="ntqlineedit.html">TQLineEdit</a> *le3 = new <a href="ntqlineedit.html">TQLineEdit</a>( this );
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le3-><a href="ntqlineedit.html#setText">setText</a>( "45" );
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fields.<a href="#insert">insert</a>( le1, "Surname" );
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fields.<a href="#insert">insert</a>( le2, "Forename" );
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fields.<a href="#insert">insert</a>( le3, "Age" );
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<a href="qptrdictiterator.html">TQPtrDictIterator</a><char> it( fields );
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for( ; it.<a href="qptrdictiterator.html#current">current</a>(); ++it )
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cout << it.<a href="qptrdictiterator.html#current">current</a>() << endl;
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cout << endl;
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if ( fields[le1] ) // Prints "Surname: Simpson"
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cout << fields[le1] << ": " << le1-><a href="ntqlineedit.html#text">text</a>() << endl;
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if ( fields[le2] ) // Prints "Forename: Homer"
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cout << fields[le2] << ": " << le2-><a href="ntqlineedit.html#text">text</a>() << endl;
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fields.<a href="#remove">remove</a>( le1 ); // Removes le1 from the dictionary
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cout << le1-><a href="ntqlineedit.html#text">text</a>() << endl; // Prints "Simpson"
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</pre>
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In this example we use a dictionary to add an extra property (a
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char*) to the line edits we're using.
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<p> See <a href="ntqdict.html">TQDict</a> for full details, including the choice of dictionary
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size, and how deletions are handled.
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<p> <p>See also <a href="qptrdictiterator.html">TQPtrDictIterator</a>, <a href="ntqdict.html">TQDict</a>, <a href="ntqasciidict.html">TQAsciiDict</a>, <a href="ntqintdict.html">TQIntDict</a>, <a href="collection.html">Collection Classes</a>, <a href="collection.html">Collection Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQPtrDict"></a>TQPtrDict::TQPtrDict ( int size = 17 )
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</h3>
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<p> Constructs a dictionary using an internal hash array with the size
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<em>size</em>.
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<p> Setting <em>size</em> to a suitably large <a href="primes.html#prime">prime</a> number (equal to or
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greater than the expected number of entries) makes the hash
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distribution better and improves lookup performance.
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<h3 class=fn><a name="TQPtrDict-2"></a>TQPtrDict::TQPtrDict ( const <a href="ntqptrdict.html">TQPtrDict</a><type> & dict )
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</h3>
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<p> Constructs a copy of <em>dict</em>.
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<p> Each item in <em>dict</em> is inserted into this dictionary. Only the
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pointers are copied (shallow copy).
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<h3 class=fn><a name="~TQPtrDict"></a>TQPtrDict::~TQPtrDict ()
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</h3>
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<p> Removes all items from the dictionary and destroys it.
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<p> All iterators that access this dictionary will be reset.
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<p> <p>See also <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>bool <a name="autoDelete"></a>TQPtrCollection::autoDelete () const
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</h3>
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<p> Returns the setting of the auto-delete option. The default is FALSE.
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<p> <p>See also <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>void <a name="clear"></a>TQPtrDict::clear ()<tt> [virtual]</tt>
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</h3>
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<p> Removes all items from the dictionary.
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<p> The removed items are deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
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<p> All dictionary iterators that access this dictionary will be
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reset.
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<p> <p>See also <a href="#remove">remove</a>(), <a href="#take">take</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<p>Reimplemented from <a href="ntqptrcollection.html#clear">TQPtrCollection</a>.
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<h3 class=fn>uint <a name="count"></a>TQPtrDict::count () const<tt> [virtual]</tt>
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</h3>
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<p> Returns the number of items in the dictionary.
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<p> <p>See also <a href="#isEmpty">isEmpty</a>().
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<p>Reimplemented from <a href="ntqptrcollection.html#count">TQPtrCollection</a>.
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<h3 class=fn>type * <a name="find"></a>TQPtrDict::find ( void * key ) const
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</h3>
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<p> Returns the item associated with <em>key</em>, or 0 if the key does not
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exist in the dictionary.
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<p> If there are two or more items with equal keys, then the most
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recently inserted item will be found.
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<p> Equivalent to operator[].
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<p> <p>See also <a href="#operator[]">operator[]</a>().
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<h3 class=fn>void <a name="insert"></a>TQPtrDict::insert ( void * key, const type * item )
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</h3>
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<p> Inserts the <em>key</em> with the <em>item</em> into the dictionary.
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<p> Multiple items can have the same key, in which case only the last
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item will be accessible using <a href="#operator[]">operator[]</a>().
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<p> <em>item</em> may not be 0.
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<p> <p>See also <a href="#replace">replace</a>().
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<h3 class=fn>bool <a name="isEmpty"></a>TQPtrDict::isEmpty () const
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</h3>
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<p> Returns TRUE if the dictionary is empty; otherwise returns FALSE.
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<p> <p>See also <a href="#count">count</a>().
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<h3 class=fn><a href="ntqptrdict.html">TQPtrDict</a><type> & <a name="operator-eq"></a>TQPtrDict::operator= ( const <a href="ntqptrdict.html">TQPtrDict</a><type> & dict )
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</h3>
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<p> Assigns <em>dict</em> to this dictionary and returns a reference to this
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dictionary.
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<p> This dictionary is first cleared and then each item in <em>dict</em> is
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inserted into the dictionary. Only the pointers are copied
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(shallow copy), unless <a href="ntqptrcollection.html#newItem">newItem</a>() has been reimplemented.
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<h3 class=fn>type * <a name="operator[]"></a>TQPtrDict::operator[] ( void * key ) const
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</h3>
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<p> Returns the item associated with <em>key</em>, or 0 if the key does not
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exist in the dictionary.
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<p> If there are two or more items with equal keys, then the most
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recently inserted item will be found.
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<p> Equivalent to the <a href="#find">find</a>() function.
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<p> <p>See also <a href="#find">find</a>().
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<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="read"></a>TQPtrDict::read ( <a href="ntqdatastream.html">TQDataStream</a> & s, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a> & item )<tt> [virtual protected]</tt>
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</h3>
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<p> Reads a dictionary item from the stream <em>s</em> and returns a
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reference to the stream.
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<p> The default implementation sets <em>item</em> to 0.
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<p> <p>See also <a href="#write">write</a>().
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<h3 class=fn>bool <a name="remove"></a>TQPtrDict::remove ( void * key )
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</h3>
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<p> Removes the item associated with <em>key</em> from the dictionary.
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Returns TRUE if successful, i.e. if <em>key</em> is in the dictionary;
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otherwise returns FALSE.
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<p> If there are two or more items with equal keys, then the most
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recently inserted item will be removed.
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<p> The removed item is deleted if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.
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<p> All dictionary iterators that refer to the removed item will be
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set to point to the next item in the dictionary traversal order.
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<p> <p>See also <a href="#take">take</a>(), <a href="#clear">clear</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>void <a name="replace"></a>TQPtrDict::replace ( void * key, const type * item )
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</h3>
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<p> If the dictionary has key <em>key</em>, this key's item is replaced with
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<em>item</em>. If the dictionary doesn't contain key <em>key</em>, <em>item</em> is
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inserted into the dictionary using key <em>key</em>.
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<p> <em>item</em> may not be 0.
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<p> Equivalent to
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<pre>
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TQPtrDict<ItemType> dict;
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...
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if ( dict.<a href="#find">find</a>( key ) )
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dict.<a href="#remove">remove</a>( key );
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dict.<a href="#insert">insert</a>( key, item );
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</pre>
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<p> If there are two or more items with equal keys, then the most
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recently inserted item will be replaced.
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<p> <p>See also <a href="#insert">insert</a>().
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<h3 class=fn>void <a name="resize"></a>TQPtrDict::resize ( uint newsize )
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</h3>
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<p> Changes the size of the hash table to <em>newsize</em>. The contents of
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the dictionary are preserved, but all iterators on the dictionary
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become invalid.
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<h3 class=fn>void <a name="setAutoDelete"></a>TQPtrCollection::setAutoDelete ( bool enable )
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</h3>
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<p> Sets the collection to auto-delete its contents if <em>enable</em> is
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TRUE and to never delete them if <em>enable</em> is FALSE.
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<p> If auto-deleting is turned on, all the items in a collection are
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deleted when the collection itself is deleted. This is convenient
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if the collection has the only pointer to the items.
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<p> The default setting is FALSE, for safety. If you turn it on, be
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careful about copying the collection - you might find yourself
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with two collections deleting the same items.
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<p> Note that the auto-delete setting may also affect other functions
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in subclasses. For example, a subclass that has a <a href="#remove">remove</a>()
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function will remove the item from its data structure, and if
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auto-delete is enabled, will also delete the item.
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<p> <p>See also <a href="ntqptrcollection.html#autoDelete">autoDelete</a>().
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<p>Examples: <a href="grapher-nsplugin-example.html#x2769">grapher/grapher.cpp</a>, <a href="scribble-example.html#x924">scribble/scribble.cpp</a>, and <a href="bigtable-example.html#x1291">table/bigtable/main.cpp</a>.
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<h3 class=fn>uint <a name="size"></a>TQPtrDict::size () const
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</h3>
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<p> Returns the size of the internal hash table (as specified in the
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constructor).
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<p> <p>See also <a href="#count">count</a>().
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<h3 class=fn>void <a name="statistics"></a>TQPtrDict::statistics () const
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</h3>
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<p> Debugging-only function that prints out the dictionary
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distribution using <a href="ntqapplication.html#qDebug">tqDebug</a>().
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<h3 class=fn>type * <a name="take"></a>TQPtrDict::take ( void * key )
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</h3>
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<p> Takes the item associated with <em>key</em> out of the dictionary
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without deleting it (even if <a href="ntqptrcollection.html#setAutoDelete">auto-deletion</a> is enabled).
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<p> If there are two or more items with equal keys, then the most
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recently inserted item will be removed.
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<p> Returns a pointer to the item taken out, or 0 if the key does not
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exist in the dictionary.
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<p> All dictionary iterators that refer to the taken item will be set
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to point to the next item in the dictionary traversal order.
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<p> <p>See also <a href="#remove">remove</a>(), <a href="#clear">clear</a>(), and <a href="ntqptrcollection.html#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="write"></a>TQPtrDict::write ( <a href="ntqdatastream.html">TQDataStream</a> & s, <a href="ntqptrcollection.html#Item">TQPtrCollection::Item</a> ) const<tt> [virtual protected]</tt>
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</h3>
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<p> Writes a dictionary item to the stream <em>s</em> and returns a
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reference to the stream.
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<p> <p>See also <a href="#read">read</a>().
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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